CN210107510U - Double air intake range hood - Google Patents
Double air intake range hood Download PDFInfo
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- CN210107510U CN210107510U CN201920532952.6U CN201920532952U CN210107510U CN 210107510 U CN210107510 U CN 210107510U CN 201920532952 U CN201920532952 U CN 201920532952U CN 210107510 U CN210107510 U CN 210107510U
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Abstract
The utility model provides a two air inlet range hood, includes fan frame and collection petticoat pipe, and fan frame internally mounted has centrifugal fan, and centrifugal fan has left side air intake and right side air intake, is equipped with the air intake on the collection petticoat pipe, and fan frame top is equipped with air outlet, its characterized in that: the air inlet and the air outlet are positioned on the same side of the vertical central line of the impeller, the front-back width Y of the projection overlapping area of the inner diameters of the air inlet, the air outlet and the impeller on the vertical projection plane, the front-back width X1 of the air inlet, the front-back width X2 of the air outlet and the inner diameter D of the impeller meet the requirements that Y/X1 is more than 0.3, Y/X2 is more than 0.3, and Y/D is more than 0.3. The utility model has the advantages that: the projection of the air inlet, the air outlet and the impeller inner diameter of the double-air-inlet range hood on the vertical projection surface meets the requirements that Y/X1 is more than 0.3, Y/X2 is more than 0.3 and Y/D is more than 0.3, so that the air channel is smoother, and when the fluid at the air inlet points to the fan inlet, the fluid is perpendicular to the lower splitter plate, the splitting effect is good, and the path of a large flow area is short and smooth.
Description
Technical Field
The utility model relates to a range hood especially relates to a two air inlet range hood.
Background
Chinese cooking can produce a large amount of oil smoke, and in order to keep the kitchen environment clean and the health of human body, the range hood has become one of the indispensable equipment in modern family kitchen. When the fan works, the separation of high-speed airflow on the impeller and the impact on the volute become the main cause of noise, and a user is influenced by the noise during cooking, possibly causing discomfort such as headache, dysphoria or palpitation and the like, and affecting cooking experience and physical health of people. In addition, for the range hood with the double air inlet structure, in the operation process of the range hood, oil smoke flows from bottom to top under the action of the fan, and flows leftwards to rightwards to the inlet of the fan under the action of the attached wall of the flow distribution plate after encountering the flow distribution plate. Coanda effect is also known as the coanda effect and refers to the tendency of a fluid to flow away from its original direction of flow and instead follow a convex object surface when there is surface friction between the fluid and the surface of the object over which it flows (i.e., fluid viscosity) and, as long as the curvature is appropriate, the fluid follows the surface of the object. Therefore, the position relation and the structure of the air inlet, the air outlet and the lower splitter plate of the volute of the fan directly determine whether the oil smoke channel is smooth or not, and further the oil smoke absorption effect of the range hood is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the first technical problem that to above-mentioned prior art current situation, provide a more unobstructed two air inlet range hood in inside wind channel.
The utility model aims to solve the second technical problem to provide a reposition of redundant personnel is effectual, the little double-inlet range hood of flow loss to above-mentioned prior art current situation
The utility model provides a technical scheme that above-mentioned first technical problem adopted does: this double-air inlet range hood, include the fan frame and locate the collection petticoat pipe of fan frame below, fan frame internally mounted has centrifugal fan, centrifugal fan includes the spiral case and installs at the inside impeller of spiral case, and centrifugal fan has left side air intake and right side air intake, is equipped with the air intake on the collection petticoat pipe, and fan frame top is equipped with air outlet, its characterized in that: the air inlet and the air outlet are positioned on the same side of the vertical central line of the impeller, and the front-back width Y of the projection overlapping area of the inner diameters of the air inlet, the air outlet and the impeller on the vertical projection plane, the front-back width X1 of the air inlet, the front-back width X2 of the air outlet and the inner diameter D of the impeller meet Y/X1>0.3, Y/X2>0.3 and Y/D > 0.3.
Preferably, the air inlet and the air outlet are arranged on the front side of the vertical central line of the impeller, and the air outlet is positioned right above the air inlet.
The volute is provided with a lower splitter plate, and a lower ridge line MN of the lower splitter plate inclines downwards from front to back.
Preferably, the radius of the front edge R of the bottom of the lower splitter plate is smaller than that of the rear edge R. Like this, under the same flow, the rear velocity of flow obtains promoting, and the small flow district wind speed promotes promptly to make the oil smoke can get into the fan fast.
Further preferably, the radius of the front edge R and the radius of the rear edge R of the bottom of the lower splitter plate satisfy 3.5< R/R < 4.5.
As another preferred solution, the radius of the bottom front edge R and the radius of the rear edge R of the lower splitter plate are equal. Therefore, the metal plate material waste for manufacturing the volute is less, the manufacturing is easier, the production cost is reduced, and the stability of the volute is better.
The utility model provides a technical scheme that above-mentioned second technical problem adopted does, this two air inlet range hood, through the lower crest line MN mutually perpendicular of the straight line OB of the ascending mid point B of air intake fore-and-aft direction and impeller centre of a circle O and lower flow distribution plate. Therefore, when the fluid at the air inlet points to the inlet of the fan, the fluid is vertical to the lower splitter plate, the splitting effect is good, and the path of the large-flow area is short and smooth.
In order to further improve the shunting effect, the perpendicular point K of the straight line OB and the lower ridge line MN, the perpendicular point P of the straight line OP passing through the front point a of the air inlet and the lower ridge line MN, and the perpendicular point Q of the straight line CQ passing through the rear point C of the air inlet and the lower ridge line MN satisfy the following relationship: d/2-30< PK < D/2+50, D/2-30< QK < D/2+ 80.
More preferably, PK ═ QK ═ D/2 to 16.8.
In order to further improve the flow dividing effect, an included angle theta between a straight line OA passing through a front point A of the air inlet and the center O of the impeller and a straight line OC passing through a rear point C of the air inlet and the center O of the impeller meets the requirement that the included angle theta is 15 degrees < theta <30 degrees, and an included angle β between the straight line OA and a lower ridge line MN meets the requirement that the included angle theta is 65 degrees < β <90 degrees.
In order to reduce the noise of the fan, a noise reduction hole is formed in the annular wall of the volute.
Compared with the prior art, the utility model has the advantages of: the air inlet and the air outlet of the double-air-inlet range hood are positioned on the same side of the vertical central line of the impeller, and the front and back width Y of the projection overlapping area of the air inlet, the air outlet and the inner diameter of the impeller on the vertical projection surface, the front and back width X1 of the air inlet, the front and back width X2 of the air outlet and the inner diameter D of the impeller meet the following requirements: Y/X1>0.3, Y/X2>0.3, Y/D >0.3, therefore, can make the wind channel more smooth, and, when the air intake fluid points to the fan import, perpendicular to lower flow distribution plate, the reposition of redundant personnel is effectual, and the large-traffic district route is short and unobstructed.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
fig. 2 is an internal structure view of a range hood according to a first embodiment of the present invention;
fig. 3 is a schematic structural view of a fan according to a first embodiment of the present invention;
fig. 4 is a structural sectional view of a first embodiment of the present invention;
fig. 5 is a structural sectional view of a first embodiment of the present invention;
fig. 6 is a structural sectional view of a first embodiment of the present invention;
fig. 7 is a schematic structural view of a fan according to the second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The first embodiment is as follows:
as shown in fig. 1 and fig. 2, the double-intake range hood of the present embodiment includes a fan frame 1 and a smoke collecting hood 2 disposed below the fan frame, a centrifugal fan 3 is mounted inside the fan frame 1, the centrifugal fan 3 includes a volute 31 and an impeller 32 mounted inside the volute, the centrifugal fan 3 has a left air inlet 33 and a right air inlet 34, an air inlet 4 is disposed on the smoke collecting hood 2, and an air outlet 5 is disposed at the top of the fan frame 1. The structure is the same as that of the existing double-air inlet range hood.
As shown in fig. 4, the direction indicated by arrow a in fig. 4 is taken as the forward direction, the air inlet 4 and the air outlet 5 are located on the front side of the vertical center line of the impeller, and the air outlet 5 is located right above the air inlet 4. Furthermore, the coincidence degree of the inner diameters of the air inlet 4, the air outlet 5 and the impeller 32 on a vertical projection plane is at least 30%, namely the front-back width Y of the projection coincidence area of the inner diameters of the air inlet 4, the air outlet 5 and the impeller 32 on the vertical projection plane, the front-back width X1 of the air inlet 4, the front-back width X2 of the air outlet 5 and the inner diameter D of the impeller meet Y/X1>0.3, Y/X2>0.3 and Y/D > 0.3.
As shown in fig. 2 and 3, the bottom of the scroll casing 31 has a lower flow distribution plate 311, and a lower ridge MN of the lower flow distribution plate 311 is inclined downward from front to rear. Moreover, the radius of the front edge R at the bottom of the lower splitter plate 311 is smaller than that of the rear edge R, and the most preferred scheme is that the radius of the front edge R at the bottom of the lower splitter plate 311 and the radius of the rear edge R satisfy 3.5< R/R <4.5, and accordingly, on the same horizontal plane H, the rear air inlet gap L2 at the rear edge of the lower splitter plate 311 is smaller than the front air inlet gap L1 at the front edge. According to the fluid continuity equation, the wind speed V is Q/S, Q is flow, S is a section, and under the same flow, the wind speed at the rear side part of the fan is increased, so that the wind speed in a small flow area is increased, and oil smoke can rapidly enter the fan.
As shown in fig. 5, an included angle θ between a straight line OA passing through a front point a of the air inlet 4 and a center O of the impeller and a straight line OC passing through a rear point C of the air inlet 4 and the center O of the impeller satisfies 15 ° < θ <30 °, and an included angle β between the straight line OA and the lower ridge MN satisfies 65 ° < β <90 °.
As shown in fig. 6, a straight line OB passing through the center point B of the air inlet 4 in the front-rear direction and the center O of the impeller is perpendicular to the lower ridge line MN of the lower splitter plate 31. The following relations are satisfied by a perpendicular point K of the straight line OB and the lower ridge line MN, a perpendicular point P of the straight line OP passing through a front point A of the air inlet 4 and the lower ridge line MN, and a perpendicular point Q of the straight line CQ passing through a rear point C of the air inlet 4 and the lower ridge line MN: d/2-30< PK < D/2+50, D/2-30< QK < D/2+ 80. The optimal scheme is as follows: PK-QK-D/2-16.8
In addition, in order to reduce the fan noise, the volute annular wall 312 of the present embodiment is provided with noise reduction holes 313, and the noise reduction holes 313 are distributed over the whole volute annular wall.
Example two:
as shown in fig. 7, the radius of the bottom front edge R and the bottom rear edge R of the lower splitter plate 311 of the volute of the present embodiment is equal. Therefore, the metal plate material waste for manufacturing the volute 3 is less, the manufacturing is easier, the production cost is reduced, and the stability of the volute is better. The rest of the structure of the present embodiment is the same as that of the first embodiment, and will not be described herein.
Claims (10)
1. The utility model provides a two air inlet range hood, includes fan frame (1) and collection petticoat pipe (2) of locating the fan frame below, fan frame (1) internally mounted has centrifugal fan (3), centrifugal fan (3) include spiral case (31) and install impeller (32) inside the spiral case, and centrifugal fan (3) have left side air intake (33) and right side air intake (34), are equipped with air intake (4) on collection petticoat pipe (2), and fan frame (1) top is equipped with air outlet (5), its characterized in that: the air inlet (4) and the air outlet (5) are located on the same side of the vertical central line of the impeller, and the front-back width Y of the projection overlapping area of the inner diameters of the air inlet (4), the air outlet (5) and the impeller (32) on the vertical projection plane, the front-back width X1 of the air inlet (4), the front-back width X2 of the air outlet (5) and the inner diameter D of the impeller meet Y/X1>0.3, Y/X2>0.3 and Y/D > 0.3.
2. The double-intake range hood of claim 1, wherein: the air inlet (4) and the air outlet (5) are arranged on the front side of the vertical central line of the impeller, and the air outlet (5) is positioned right above the air inlet (4).
3. The double-air-intake range hood of claim 1 or 2, characterized in that: the volute (31) is provided with a lower splitter plate (311), and a lower ridge line MN of the lower splitter plate (311) inclines downwards from front to back.
4. A double-intake range hood according to claim 3, wherein: the radius of the front edge R of the bottom of the lower splitter plate (311) is smaller than that of the rear edge R.
5. The double-intake range hood of claim 4, wherein: the radius of the front edge R and the radius of the rear edge R of the bottom of the lower splitter plate (311) meet 3.5< R/R < 4.5.
6. A double-intake range hood according to claim 3, wherein: the radius of the front edge R and the rear edge R of the bottom of the lower splitter plate (311) is equal.
7. A double-intake range hood according to claim 3, wherein: a straight line OB passing through a middle point B in the front-back direction of the air inlet (4) and a circle center O of the impeller is perpendicular to a lower ridge line MN of the lower splitter plate (311).
8. The double-intake range hood of claim 7, wherein: the straight line OB and the perpendicular point K of the lower ridge line MN, the straight line OP passing through the front point A of the air inlet (4) and the perpendicular point P of the lower ridge line MN, and the straight line CQ passing through the rear point C of the air inlet (4) and the perpendicular point Q of the lower ridge line MN satisfy the following relations: d/2-30< PK < D/2+50, D/2-30< QK < D/2+ 80.
9. The double-air-inlet range hood according to claim 3, characterized in that an included angle theta between a straight line OA passing through a front point A of the air inlet (4) and the center O of the impeller and a straight line OC passing through a rear point C of the air inlet (4) and the center O of the impeller satisfies 15 degrees < theta <30 degrees, and an included angle β between the straight line OA and a lower ridge line MN satisfies 65 degrees < β <90 degrees.
10. The double-intake range hood of claim 1, wherein: the annular wall (312) of the volute (31) is provided with a noise reduction hole (313).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920532952.6U CN210107510U (en) | 2019-04-18 | 2019-04-18 | Double air intake range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920532952.6U CN210107510U (en) | 2019-04-18 | 2019-04-18 | Double air intake range hood |
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| Publication Number | Publication Date |
|---|---|
| CN210107510U true CN210107510U (en) | 2020-02-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920532952.6U Active CN210107510U (en) | 2019-04-18 | 2019-04-18 | Double air intake range hood |
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| CN (1) | CN210107510U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107932A (en) * | 2019-04-18 | 2019-08-09 | 宁波方太厨具有限公司 | A kind of double air-inlet range hoods |
| CN113446638A (en) * | 2020-03-25 | 2021-09-28 | 青岛海尔智能技术研发有限公司 | Fume exhaust fan |
-
2019
- 2019-04-18 CN CN201920532952.6U patent/CN210107510U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107932A (en) * | 2019-04-18 | 2019-08-09 | 宁波方太厨具有限公司 | A kind of double air-inlet range hoods |
| CN110107932B (en) * | 2019-04-18 | 2024-02-20 | 宁波方太厨具有限公司 | Double-air-inlet range hood |
| CN113446638A (en) * | 2020-03-25 | 2021-09-28 | 青岛海尔智能技术研发有限公司 | Fume exhaust fan |
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